MPEG-2 (Moving Picture Experts Group-2) system based method and system for realizing video and audio synchronization

Abstract

The invention discloses MPEG-2 system based method and system for realizing video and audio synchronization. The method comprises the following steps of: setting a local system clock (STC), wherein the local system clock (STC) adopts a local reference clock as a reference clock and adopts an audio playing time stamp (PTS) corresponding to the current audio signal as a calibrating clock; comparing a video playing time stamp (PTS) corresponding to the current video signal with the local system clock (STC) and processing the current video signal according to a compared result. The technical scheme recovers the local system clock (STC) by adopting the local reference clock as the reference clock and adopting the audio playing time stamp (PTS) as the calibrating clock, adjusts the playing condition of the video signal by the local system clock (STC), realizes the synchronous playing of video and audio and prevents the synchronous jumping or replaying condition of the video and audio signal caused by the joggling of a program reference clock (PCR).

Description

technical field [0001] The present invention relates to the field of multimedia technology, in particular to a method and system for realizing video and audio synchronization based on the MPEG-2 (Moving Picture Experts Group: Moving Picture Experts Group) system. Background technique [0002] The IPTV (Internet Protocol Television: Interactive Network Television) system generally uses the MPEG-2 system to transmit video and audio media information, such as figure 1 As shown, the IPTV system usually uses the infrastructure of the broadband network to collect and encode the data from the program source in the program processing unit, then distribute the content through the content distribution module, and then use the Internet Protocol (IP) in the metropolitan area network or access The program is transmitted through the network, and finally arrives at the user terminal for playback; the processed program can also be managed by the EPG (Electronic Program Guide: Electronic Pro...

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the decoding and playing of audio and video in the prior art are synchronized based on the program reference clock PCR. Therefore, when the program reference clock PCR jitters, the audio signal and the video signal may skip or replay frames

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